Industrial-Strength adhesive comparison

One item I've always tried to
keep in the tool box is a tube of cyanoacrylate (SuperGlue).

I usually get to use a tube 2
or 3 times before it clogs up...even the more advanced containers still
seem to eventually stop flowing well before the glue is gone.

Welder is a new all purpose
contact adhesive I've had great luck with in the past year that's made
with a chemical known as Toluene.
It's somewhere between SuperGlue and a 2 part epoxy and is easy to work
with and even easier to open back up a few months later without the cap
being permanently stuck.

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Toluene is one of those solvents that are best avoided. It is a neurosurpressant (even to the point of death in case of people who sniff glue to get high) and can cause irreparable damage to the nervous system. Like a lot of solvents it can penetrate the skin and enter the bloodstream. It is often contaminated with benzene, which is toxic and a carcinogen. Toluene was banned in Europe for sale to consumers in 2004.